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Electric fuel pump leakage

Profileair

By Profileair
in Vintage Mooneys (pre-J models)

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Profileair Rookie

Profileair

Posted
Posted

I have a 1964/E. The vent fitting off the electricity fuel pump started seeping. Just a few drops. Does anyone know what this vent is for?. I have it capped off to stop the dripping on the hanger floor. Ground runs with the cap on appear to have no effect on fuel pressure etc. Engine operation looks normal. Any thoughts. Thanks Profileair

Guest

Guest

Posted
Posted

I have a 1964/E. The vent fitting off the electricity fuel pump started seeping. Just a few drops. Does anyone know what this vent is for?. I have it capped off to stop the dripping on the hanger floor. Ground runs with the cap on appear to have no effect on fuel pressure etc. Engine operation looks normal. Any thoughts. Thanks Profileair

The vent fitting is meant to keep the fuel from mixing with the electricity inside the motor. If its leaking from the vent fitting the pump needs repair.

Clarence

slowflyin Mentor

slowflyin

Posted
Posted

+1 for repair. The vent ports the fuel away from the energized half the assembly.

Sent from my iPad using Tapatalk

Guest

Guest

Posted
Posted

It would come out the vent except the poster has capped the vent.

Clarence

DrBill Mentor

DrBill

Posted
Posted

Yep.. cap the vent and the gas can get into the motor and you could have a fire.

 

I'm selling a used DUKES pump that you can send away, get overhauled and then swap with very little down time.

In the Classifieds for only $100.

 

BILL

Guest

Guest

Posted
Posted

The vent fitting is meant to keep the fuel from mixing with the electricity inside the motor. If its leaking from the vent fitting the pump needs repair.

Clarence

Edit: I guess I should have been clearer in my post. The vent keeps the fuel from mixing with the electricity, installing a cap defeats the vent and may be dangerous.

Clarence

Steve65E-NC Proficient

Steve65E-NC

Posted
Posted

First you need to look at your log books and determine if this is the original unit. If it is you will probably have to buy new, buy rebuilt, or change to Weldon. The Dukes fuel pump on my 65E faided about two years ago. I sent it to ???? for an IRAN evaluation. I was told by Russ ?? that it was beyond repair or rebuild. I purchased a new Dukes from Lasar and installed at annual. The change out is pretty easy.

I looked at a change to Weldon (instructions are available from Mooney), but decided it was a little complicated.

On the other hand, if your pump is more recent,say only 20 years old instead of 50, you might want to consider an IRAN repair and return to service (look in the archives). Apparantly a complete rebuild is very expensive, hard to come by, and often un-necessary. Dukes was purchased at about the time of my experience and I think they have make it difficult to get support.

Steve65E-NC Proficient

Steve65E-NC

Posted
Posted

  When I replaced my electric fuel pump several years ago (see above), I found the following company to be very helpful in deciding that I needed a new pump.  www.dgsupply.com  D&G Supply, Niles, Mi.  Russell Romey looked at my unit and gave me advice with no charge.  I think D&G has a good stock of Duke repair parts.  Give them a call.

wombat Mentor

wombat

Posted
Posted

I had the same issue this summer.  Bought the new drop-in replacement from Weldon and everything has been peachy since then.   Still have the leaking Dukes pump around, don't know what to do with it.   Hate to throw it away.   Not worth selling as far as I can tell.

BigTex Mentor

BigTex

Posted
Posted

I had the same issue this summer. Bought the new drop-in replacement from Weldon and everything has been peachy since then. Still have the leaking Dukes pump around, don't know what to do with it. Hate to throw it away. Not worth selling as far as I can tell.

those pumps have a core value of $400 -$600 so you might contact some of the rebuild shops to see what they'd give you for it.
Profileair Rookie

Profileair

Posted
  • Author
Posted

Thanks to everyone for the info. By the way the cap is to keep the fuel from spilling onto the hanger floor. I'm on a new pump and it sounds $$$$. Thanks again.

Steve65E-NC Proficient

Steve65E-NC

Posted
Posted

Wow, if Weldon has a direct, bolt in, no paperwork, legal replacement for the Dukes electric fuel pump in our older Mooneys that is really good news. As I recall the advantage of the Weldon is that it is designed for continuous usage whereas the Dukes is just designed for intermitant usage.

Sometimes I just forget to turn off the fuel pump. As I understand, with the Dukes pump I risk an $800 replacement. With the Weldon, not so much.

Can someone confirm my thinking and the facts about the new Weldon.

DrBill Mentor

DrBill

Posted
Posted

Wow, if Weldon has a direct, bolt in, no paperwork, legal replacement for the Dukes electric fuel pump in our older Mooneys that is really good news. As I recall the advantage of the Weldon is that it is designed for continuous usage whereas the Dukes is just designed for intermitant usage.

Sometimes I just forget to turn off the fuel pump. As I understand, with the Dukes pump I risk an $800 replacement. With the Weldon, not so much.

Can someone confirm my thinking and the facts about the new Weldon.

TRUE.. I had a Weldon installed this annual.  Continuous duty too.  Sounds entirely different ! Have to get use to that !

A&P said it was a bit tricky with the bracket but got it done.

BILL

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